Pen grip



FIG. 1 is a front bottom perspective view of the pen grip showing my new design;

FIG. 2 is a right side elevational view which is a mirror image of the front, back and left sides thereof;

FIG. 3 is a bottom plan view thereof; and,

FIG. 4 is a top plan view thereof.

The broken lines, all of which depict environmental structure, are for illustrative purposes only and form no part of the claimed design. The broken lines shown in FIG. 4, which define the bounds of the claimed design, form no part thereof. 

The ornamental design for a pen grip, as shown and described. 